The HI 981408 water pH meter has been specifically designed to answer the needs of growers in hydroponics, greenhouses and nurseries. It features exacting qualities required for checking the pH of the fertilizer solution during preparation. With a sturdy body, it also floats so that it can be quickly retrieved if accidentally dropped in the tank.This HI 981408 pH meter run for 2000 hours continuously on common AA-type batteries – thereby, eliminating the need for frequent battery replacement. The calibration procedure in this HANNA instrument has been simplified to one point through a dial on the front of the meter. The outer casing also incorporates a molded eye so you can hang the meter when not in use. (Professional Supplies : Water Testing Equipment) Item: HANA-X-HH-WATR-HI981408